General Troubleshooting - Dell Latitude 12 7212 Owner's Manual

3 3 BIOS recovery 1
3 4 BIOS recovery 2

General Troubleshooting

Table 11. General Troubleshooting
Issue
Battery Charging
No POST
Video
BIOS
Touchpad and Keyboard
Integrated NIC
Suggested Troubleshooting Steps
The battery should be charged while the system is off for faster charge time. Users may notice longer
charge times when the system is turned on and running graphics-intensive applications.
CAUTION: There is a danger of a new battery exploding if it is incorrectly installed. Replace the
battery only with the same or equivalent type recommended by the manufacturer. Discard used
batteries according to the manufacturer's instructions.
When a user starts the tablet, the first thing that the BIOS does is to perform the Power-On Self-Test
(POST). The POST is a built-in diagnostic program that checks the hardware to make sure that everything
is present and functioning properly, before the BIOS begins the actual boot.
If the system does not perform a Power-On Self-Test, there are various things that you can look for:
1 Check that the system has a power light.
2 If the system has no power light, make sure that it is plugged into AC power.
3 Remove the battery. Make sure that the power is turned off and the system is unplugged.
4 Remove all CRUs from the system and reconnect the AC adapter to the system and try again.
5 Run the ePSA diagnostics.
If the LCD on the system does not show any display or has other problems, here are some basic steps that
you can perform:
1 If the LCD is not displaying video or the video is garbled, run the ePSA diagnostics.
2 If the LCD is not displaying any video, connect an external monitor to eliminate a no-POST problem. A
good image on the external monitor eliminates a video card problem or a POST problem.
3 Connect an external monitor, when possible, for all LCD-related problems to help eliminate a possible
software or video card problem.
4 If the LCD has dim video, adjust the brightness or connect an AC adapter to eliminate a power
management conservation setting in the BIOS.
5 If the LCD has lines on the screen, check the system during POST and system setup, to determine if
the lines are present in all modes of operation. Run the ePSA diagnostics.
6 If the LCD has color problems, run the ePSA diagnostics.
7 If the LCD has burned-out pixels, verify that the LCD is still within LCD standard guidelines. For Dell
internal users only, click here.
If users have problems while using the tablet, the problems may be related to BIOS settings configured
incorrectly in BIOS/System Setup. Check the System Setup pages to verify the settings on each page. Try
resetting BIOS to default settings by pressing Alt+F.
To troubleshoot touchpad and keyboard-related problems, you can perform the following steps:
1 Attach an external mouse or keyboard to check for peripheral functionality.
2 Run the ePSA diagnostics.
If the system is not able to identify any network after connecting the network cable to the network port,
try the following troubleshooting steps:
recovery image nor found
recovery image found but invalid
Troubleshooting 71